Sony Rumors網站更新消息了
UPDATE2: Most of the mystery is given by the “4/3〃 sign. We don’t know if it means that:
1) Sony will become a strong competitor of the Panasonic GH1 camera (which has a 4/3 sensor)
2) Sony will use a 4/3 sensor but with a proprietary mount
3) Sony will join the MicroFourThirds system

Option 1 is the more realistic answer.
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43 Rumors網站也更新消息了
UPDATE2: It is almost sure that Sony will not join the MFT system. They will have a completely independent system and lens-mount.
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目前各方討論及線索看來
應該是Sony自己所推的無反光鏡系統獨立規格
只是感光元件可能是用4/3尺寸的
這也比較符合Sony的一貫作風
總之
市場上多幾家廠商競爭對消費者而言總是好的
還是樂觀其成